SeaLife Aquapod Mini
The SeaLife Aquapod Mini is a great camera pole that for underwater. It is completely collapasible and is built from polycarbonate material and marine grade anodized aluminum. It extends from 15.5 inches (39cm) to 38 inches (97cm) which allows you to get your camera close to your subject yet maintaining your distance. It's ideal for exciting shark images and video, as well as easily frightened ocean species.
It can also be rotated to easily take selfies. In addition, it comes with a 1/4"-20 tripod & GoPro mount which allows you to mount your underwater cameras and GoPro.